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Chapter 3. Modifying a MachineSet

You can make changes to a MachineSet, such as adding labels, changing the instance type, or changing block storage.

Note

If you need to scale a MachineSet without making other changes, see Manually scaling a MachineSet.

3.1. Modifying a MachineSet
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To make changes to a MachineSet, edit the MachineSet YAML. Then remove all machines associated with the MachineSet by deleting or scaling down the machines to 0. Then scale the replicas back to the desired number. Changes you make to a MachineSet do not affect existing machines.

If you need to scale a MachineSet without making other changes, you do not need to delete the machines.

Note

By default, the OpenShift Container Platform router pods are deployed on workers. Because the router is required to access some cluster resources, including the web console, do not scale the worker MachineSet to 0 unless you first relocate the router pods.

Prerequisites

  • Install an OpenShift Container Platform cluster and the oc command line.
  • Log in to oc as a user with cluster-admin permission.

Procedure

  1. Edit the MachineSet: 

    $ oc edit machineset <machineset> -n openshift-machine-api
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  2. Scale down the MachineSet to 0: 

    $ oc scale --replicas=0 machineset <machineset> -n openshift-machine-api
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    Or: 

    $ oc edit machineset <machineset> -n openshift-machine-api
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    Wait for the machines to be removed.

  3. Scale up the MachineSet as needed: 

    $ oc scale --replicas=2 machineset <machineset> -n openshift-machine-api
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    Or: 

    $ oc edit machineset <machineset> -n openshift-machine-api
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    Wait for the machines to start. The new Machines contain changes you made to the Machineset.

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